i got a summer job working for the state, but it was at the tollway. I got that job because i knew the leader of the democratic party for my county and a democratic governor had just been elected. Most of those guys who hold road signs don't even work for the state. Most road construction is contracted out, so I'd be contacting paving companies for that kinda job. You can also do internships at local and state level Departments of Transportation but they normally hire engineering students.